<template>
    <div>
  <!-- 面包屑导航区 -->
<el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>参数列表</el-breadcrumb-item>
</el-breadcrumb>
<!-- 卡片试图区 -->
<el-card>
<!-- 头部警告区 -->
  <el-alert
    title="注意：只允许为第三季分类设置相关参数！"
    type="warning"
    :closable="false"
    show-icon=""
    >
  </el-alert>
  <!-- 选择商品分类区域 -->
  <el-row class="cat_opt">
      <el-col>
          <span>
         选择商品分类：
          </span>
          <!-- 选择商品分类的级联选择框 -->
          <!-- options="catelist"获取数据 -->
          <el-cascader
    v-model="selectedCateKeys"
    :options="catelist"
    :props="{ expandTrigger: 'hover',
             value:'cat_id',
             label:'cat_name',
             children:'children'}"
    @change="handleChange"></el-cascader>
      </el-col>
  </el-row>
  <!-- tab页签区域 -->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
        <!-- 动态参数表格 -->
        <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
             <el-table-column type="expand">
                 <template slot-scope="scope">
                     <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item ,i) in scope.row.attr_vals " :key="i" closable @close="handleClose(i,scope.row)">
                     {{item}}
                </el-tag>
                <!-- 输入文本框 -->
                <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
<!-- //添加按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                 </template>
                 </el-table-column>
        <!-- 索引列 -->

        <el-table-column type="index"></el-table-column>
        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
         <el-table-column label="操作">
             <template slot-scope="scope">
              <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)" >编辑</el-button>
              <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
             </template>
             </el-table-column>
        </el-table>
        </el-tab-pane>
        <!-- 添加静态参数的面板 -->
    <el-tab-pane label="静态属性" name="only">
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
                         <el-table-column type="expand">
                 <template slot-scope="scope">
                     <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item ,i) in scope.row.attr_vals " :key="i" closable @close="handleClose(i,scope.row)">
                     {{item}}
                </el-tag>
                <!-- 输入文本框 -->
                <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
<!-- //添加按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                 </template>
                 </el-table-column>
        <!-- 索引列 -->

        <el-table-column type="index"></el-table-column>
        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
         <el-table-column label="操作">
             <template slot-scope="scope">
              <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
              <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
             </template>
             </el-table-column>
        </el-table>




        </el-tab-pane>

  </el-tabs>
</el-card>
<!-- 添加参数的对话框 -->
<el-dialog
  :title="'添加'+titleText"
  :visible.sync="addDialogVisible"
  width="50%" @close="addDialogClosed">

<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
</el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
<!-- 修改参数的对话框 -->
<el-dialog
  :title="'修改'+titleText"
  :visible.sync="editDialogVisible"
  width="50%" @close="editDialogClosed">

<el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
</el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>
<script>
export default {
  data () {
    return {
      catelist: [],
      // 级联选择框双向绑定
      selectedCateKeys: [],
      // 被激活的m默认页签的名称first是第一个
      activeName: 'many',
      // 动态属性的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单验证的规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改表单的数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }

    }
  },
  created () {
    this.getCateList()
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的3级id
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态参数'
    }
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 级联选择框选中项变化，会触发这个函数
    async handleChange () {
      this.getParamsData()
    },
    // tab页签事件的处理函数
    handleTabClick () {
      this.getParamsData()
      console.log(this.activeName)
    },
    // 获取参数列表的数据
    async getParamsData () {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      //  console.log(this.selectedCateKeys);
      // 根据所选分类的id和当前所处的面板获取所对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      // console.log(res.data);
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框输入的值
        item.inputValue = ''
      })

      if (this.activeName == 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams () {
      this.$refs.addFormRef.validate(
        async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName
            }
          )
          if (res.meta.status !== 201) {
            return this.$message.error('添加参数列表失败！')
          }
          this.$message.success('添加参数成功！')
          this.addDialogVisible = false
          this.getParamsData()
        })
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog (attrId) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`
        , { params: { attr_sel: this.activeName } }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除对应的参数项
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消了删除！')
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    //    文本框失去焦点，或摁下enter都会触发
    async  handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return则证明了输入的内容，需要做后序处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 将对attr——vals的操作保存到数据库
      this.saveAttrVals(row)
    },
    // 将对attr——vals的操作保存到数据库
    async saveAttrVals (row) {
      // 需要发起请求保存这种操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')

        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数成功！')
    },
    // 点击按钮，展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      //    nextTick方法作用，
      //    就是当页面上元素被重新渲染之后才能指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  }
}
</script>
<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
    margin: 10px;
}
</style>
